Hi everyone,
It's been a while since I've been on clug-talk. Lots of familiar faces
though.
I'm having some trouble with slow performance and I'm wondering if anyone has
any ideas?
I have two older HP Proliant servers (ML370 and DL360), a more modern desktop
computer and an i7 laptop and I'm h
>
> Anyone have any ideas what I should be looking at in more detail.
>
> Thanks,
> Jeff
You are probably limited by the i/o speeds of the hard drives. Your LAN can
sustain around 125MB/s, but your hard drives will not be able to read / write
that fast, you will be bound to their maximums.
H
I don't think that's the problem though. I can get > GigE read speeds
from my array.
08:46:27-root@goliath:/etc/service/dropbox-jsc $ hdparm -t
/dev/lvm-raid1/photos
/dev/lvm-raid1/photos:
Timing buffered disk reads: 512 MB in 3.00 seconds = 170.49 MB/sec
Write speeds are obviously slower bu
Try using iperf to test *just* the network.
http://sourceforge.net/projects/iperf/?_test=b
On 12-03-29 08:50 AM, Jeff Clement wrote:
I don't think that's the problem though. I can get > GigE read speeds
from my array.
08:46:27-root@goliath:/etc/service/dropbox-jsc $ hdparm -t
/dev/lvm-raid1/p
I disagree about /sys and after reading your link I feel I am safe to
remove it from servers. /sys would get a lot of use on a desktop computer
that is constantly having a variety of USB devices plugged in and removed
but on a server where your hardware better not be changing it is not
needed. Unle
Why the dedication to removing /sys? Regardless if you think you need it
or not, what is it you are trying to accomplish? It is there for a reason,
so in my opinion one should need a really good reason for deleting it.
Even on embedded machines I leave it alone.
If you plan on having a bunch of
I want to remove /sys to reduce the write cycles to the USB memory stick.
On a server I don't need the OS loading some driver for the sound card or
3D video acceleration to constantly be writing to the /sys. Not needed on a
server, don't care if pulsaudio crashes trying to load, probably going to
c
On 12-03-29 10:12 AM, Royce Souther wrote:
I want to remove /sys to reduce the write cycles to the USB memory
stick. On a server I don't need the OS loading some driver for the sound
card or 3D video acceleration to constantly be writing to the /sys. Not
needed on a server, don't care if pulsaudi
netcat (or ncat) would still be subjected to PCI/PCI-X bus limitations.
So basically when troubleshooting I would change the cables, then the
switch, then the NICs. The regular PCI bus tops out at a gigabit, so you
should still be able to test with a standard PCI (though PCI-E would be
better) NI
Thank you,
iperf reports much happier numbers:
12:13:07-root@goliath:/mnt/photos $ iperf -c screamer
Client connecting to screamer, TCP port 5001
TCP window size: 16.0 KByte (default)
---
I second the iperf suggestion. It works great for network benchmarking!
Try it with a normal window and a large window, just in case.
Small window - TCP:
Machine 1 (Server)
# iperf -s
Machine 2 (Client)
# iperf -c server_ip_address
Large window - TCP:
Machine 1 (Server)
# iperf -s -w 208k
M
I would have thought my netcat test would only be limited by the GigE card
and PCI-X bus (which should have enough bandwidth to saturate GigE).
Using ncat, instead of ncat, I get 118 MB/s dumping from /dev/zero and 95
MB/s from my array. I never would have guesses that nc had so much overhead!
My guess is that it is related to the window size. Try different
window sizes and you will see different results.
Actually, didn't someone else bring this up a month or so ago with
regards to windows file shares?
-Mark C.
On Thu, Mar 29, 2012 at 12:45 PM, Jeff Clement wrote:
> I would have thou
/sys is needed for CentOS to use LVM. My older Debian did not work this way
but CentOS 6.2 does. I may have been using LVM1 and now it is LVM2, that
could be the difference.
Gustin was right, I was wrong.
Using /sys again.
On Thu, Mar 29, 2012 at 10:19 AM, William Astle wrote:
> On 12-03-29 10
Glad it works! Now I get what you were trying to do, it did not make sense
to me before. As William said /sys should not actually write anything out
to disk.
If you get curious, the Voyage distro I use is just Debian under the hood,
with some customizations to have it run read-only by default.
Nice to see you back around Jeff...if even for a post or two! :-)
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